Subspecies, varieties, forms and cultivars of plants belonging to the Cycas rumphii complex

The C. rumphii complex comprises a number of related taxa which have sometimes been considered conspecific. Differences between these taxa lie mainly in the shape and indentation of the lamina of the megasporophylls.

Cycas thouarsiiR.Br.: has distinctly bluish new leaves with wholly spinescent petioles and the pronounced stout spines on the microsporophylls. Seeds do not have a crested sclerotests. Distribution: Madagascar, the Comoros Islands, Mayotte and the Seychelles. Scattered occurrences are also known on the East Coast of Africa from Tanzania throughout Kenya south the Mozambique.